You might consider solutions other than USB. Our PDAudio-CF card is a CF card that accepts coax and optical S/PDIF (and other IEC-958 formats). It's bit for bit accurate up to 24/192. It comes with an ALSA driver. For a front end, you might consider our Mic2496. It's a portable 24-bit dual mic pre-amp and A-to-D converter that provides phantom power and runs on a single 9 Volt battery. It will sample at rates from 32 to 192 KS/s. Please see our Web site for more details: www.core-sound.com And if you want to stick with USB you might consider M-Audio's MobilePre USB. (I'm not certain about the availability of a Linux-compatible driver.) Len Moskowitz Core Sound
